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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Cost of revenue	$ 7,583	$ 8,142	$ 24,126	$ 23,192
Gross profit	10,436	7,257	29,606	21,191
Operating expenses:
Research and development	16,081	10,825	43,938	30,143
Selling, general and administrative	16,140	13,964	49,041	42,008
Total operating expenses	32,221	24,789	92,979	72,151
Loss from operations	(16,958)	(13,604)	(49,819)	(39,530)
Non-operating expense, net:
Foreign exchange (loss) gain	(254)	8	(311)	(22)
Interest expense	(1,031)	(1,053)	(5,105)	(2,926)
Other income, net	336	513	1,095	1,288
Total non-operating expense, net	(949)	(532)	(4,321)	(1,660)
Loss before income taxes	(17,907)	(14,136)	(54,140)	(41,190)
Provision for income taxes	60	56	181	169
Net loss	$ (17,967)	$ (14,192)	$ (54,321)	$ (41,359)
Net loss per share:
Basic and diluted	$ (0.13)	$ (0.11)	$ (0.39)	$ (0.32)
Weighted average shares used for calculating net loss per share:
Basic and diluted	140,908	134,326	138,779	130,199
Product
Revenue	$ 18,019	$ 15,399	$ 53,732	$ 44,383
Government Contract
Revenue	$ 4,827	$ 3,928	$ 13,554	$ 11,430

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